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(No Model.)

. W. HIRT.

Glass Makers Crane. No. 234,7 77. Patented Nov. 23,1880.

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UNITED STATES FFICE.

XVILHELM HIRT, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOOUNNINGHAMS & 00., OF SAME PLACE.

GLASS-MAKERS CRANE.

SPECIFICATION forming part of Letters Patent No. 234,777, dated November23, 1880. Application filed October 20, 1880. (N model.)

To all whom it may concern Be it known that I, WILHELM HIRT, ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Glass Makers Cranes, 85c. and Ido hereby declare the following to be a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,forming part of this specification, in which- Figure l is a sideelevation of my improved crane, and Fig. 2 is a plan view of the same.

Like letters of reference indicate like parts wherever they occur.

1 My invention relates to an improvement in glass-blowers cranes, and isan improvement on the crane invented by me and forming the subject ofPatent No. 223,348, dated January 6, 1880; and it consists in mechanicaldevices so as arranged as to give an easy and free movement to aswinging crane having an extension-arm, which is projected by a crankoperated by gearing from the shaft of the crank, so that the angle ofpresentation of the 2 5 cylinder of glass is always the same, or nearlyso, so that as the pipe is moved toward or from the furnace it alwaystravels in a right line.

In the former device used by me, described 0 in Patent No. 223,348, thecrane was found to be somewhat cumbersome and hard to work, owing to thefriction between the arm of the crane and the extension-rod. Thisdifficulty has been obviated by my invention, which I will now proceedto describe, so that others skilled in the art may manufacture and usethe same.

The crane a is composed of a frame having a horizontal arm, I), andbraces 1) b the whole being pivoted at the points 0 c to a plate, d,which plate is fastened to an iron post by bolts or screws. On the plate(I, just above the lower pivotal connectionc with the frame a, is apinion, 0, consisting of a segment of a cir- 4 5 cular plate, the edgeor circumference of which is provided with cogs. Meshing in this pinion6 is another pinion, e, on a shaft, j, which shaft is mounted on theside of the frame a, and extends to the top thereof parallel to theplate (I. This shaft f has an arm, h, at its upper end, which extendsback. From the outer end of this arm h a rod, 45, runs forward, and isfastened to a slide or extension, is, placed on top of the arm I), andsliding between frictionrollers Z I, which extend up from both sides ofthe arm I). The number of these rollers I may be increased ordiminished, as is found necessary; butfour will generally be foundsufficient, one on each side of extension-rod k at the end of the armI), and one on each side of the rod k at a point midway between the endof the arm b and the plate d. Forward of this point is a yoke, m,extending up from the arm I) on both sides of the rod k, and in thisyoke, above the rod it, is mounted a bearing-wheel, m.

At the end of the arm 1) below, and upon which the extension-rod 76travels, is another bearing-wheel, m At the outer end of theextension-rod k is a pivoted bearing, n, upon which the blow-pipe rests.

The glory-hole of the furnace is shown by the dotted line in Fig. l atp, and the pit below the crane at p. The crane when at right angles tothe plate 61 stands in its normal condition with the extension-rod klying back on the arm I) and the bearing for the blow-pipe over the pitp; but when it is desired to insert the. cylinder of glass on the end ofthe blow-pipe in the glory-hole, by moving the crane in that directionthe gear-wheel e and shaft f turn, and by means of the crank-arm h androd t' cause the extension-arm k to move forward, so that thepipe-bearing n on the end of the same shall move in a right line tangentto the are of the circle which the end of the arm lb describes, andthereby keep the bearing of the blow-pipe on a right line with thecenter of the glory-hole.

The advantages of my improvement over my former device are, that byplacing the pinions 0 c at a greater distance from the end of the arm ba greater leverageis obtained. The friction is lessened by the use ofthe side rollers, Z l. The shaft f, instead of passin g through the armI) and brace 12, passes along the side 5 of the same, and is fastened bymeans of boxes r, thereby allowing the thickness of said arm and bracesto be materially reduced. The arm 1 and braces 12 and b are preferablycast in one piece, so as to form a frame strong and at the same timelight and compact. The pivotal arm, I), braces b 11 slide or extensionarm 70, connections 0 c to the plate (1 form a substitutefriction-rollers Z Z, rod 7;, crank-arm h, shaft f. for and do away withthe shaft of the crane as pinions e e, and plate d, substantially as andused in the former device. The crane Works for the purpose described. 15

5 with a free and more regular motion. It is In testimony whereof I havehereunto set much stronger and takes up much less room my hand.

than the former device. WILHELM HIRT.

Having thus described my invention, what I claim, and desire to secureby Letters Pat- Witnesses: [0 cut, is- R. H. WHITTLESEY,

In a swinging crane, the combination of an I T. W. BAKEWELL.

